CN110609432B - Projection device and color wheel protection method thereof - Google Patents
Projection device and color wheel protection method thereof Download PDFInfo
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- CN110609432B CN110609432B CN201810626371.9A CN201810626371A CN110609432B CN 110609432 B CN110609432 B CN 110609432B CN 201810626371 A CN201810626371 A CN 201810626371A CN 110609432 B CN110609432 B CN 110609432B
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
- G02B26/007—Optical devices or arrangements for the control of light using movable or deformable optical elements the movable or deformable optical element controlling the colour, i.e. a spectral characteristic, of the light
- G02B26/008—Optical devices or arrangements for the control of light using movable or deformable optical elements the movable or deformable optical element controlling the colour, i.e. a spectral characteristic, of the light in the form of devices for effecting sequential colour changes, e.g. colour wheels
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/20—Lamp housings
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/20—Lamp housings
- G03B21/2006—Lamp housings characterised by the light source
- G03B21/2033—LED or laser light sources
- G03B21/204—LED or laser light sources using secondary light emission, e.g. luminescence or fluorescence
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/20—Lamp housings
- G03B21/206—Control of light source other than position or intensity
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Abstract
The application provides a projection device, which comprises a processor, a driving part, a color wheel, a first sensing unit and a second sensing unit, wherein the driving part is used for driving the color wheel to rotate, a first area and a second area are arranged around the color wheel, the distance between the first area and the color wheel is smaller than or equal to a preset distance, the distance between the second area and the color wheel is larger than the preset distance, the first sensing unit is arranged in the first area and used for sensing first air pressure in the first area, and the second sensing unit is arranged in the second area and used for sensing second air pressure in the second area; the processor determines the state of the color wheel according to at least the first air pressure and the second air pressure, and controls to turn off the laser when the state of the color wheel is determined to be a non-working state. The application also provides a color wheel protection method. The laser is controlled to be turned off when the state of the color wheel is determined to be the non-working state, and the color wheel is prevented from being burnt by the laser.
Description
Technical Field
The present disclosure relates to projection technologies, and in particular, to a projection apparatus and a color wheel protection method thereof.
Background
In a laser projector, if the laser is not turned off once when the color wheel is stopped, the color wheel is burned out, resulting in distortion of the color of the projected picture. The conventional laser projector is provided with a color wheel rotating speed detector behind a color wheel to detect the rotating speed of the color wheel and feed back the rotating speed to a main chip in time in a frequency mode, and the main chip sends a laser on or laser off command to a power supply constant current plate according to the detected rotating speed value of the color wheel, so that the output of the laser voltage of the power supply constant current plate is controlled. However, in actual operation, the measurement of the color wheel rotation speed detector has certain errors, thereby affecting the control of the main chip on the laser current. One important reason for influencing the rotation speed of the color wheel is that the temperature around the rotation speed detection chip of the color wheel is increased due to poor heat dissipation inside the product, and therefore the reading of the rotation speed value of the color wheel is influenced, and finally the control of the main chip on the power supply constant current plate is influenced.
Disclosure of Invention
The application provides a projection device and a color wheel protection method thereof, which can accurately judge the state of the color wheel so as to solve the problems.
The application provides a projection device, including treater, driving piece, colour wheel, first induction element and second induction element, the driving piece is used for driving the colour wheel rotates, first region and second area have around the colour wheel, first region be with the colour wheel the distance be less than and equal to the region of predetermineeing the distance, the second area be with the colour wheel the distance be greater than the region of predetermineeing the distance, first induction element sets up in first region for respond to first atmospheric pressure in the first region, second induction element sets up in the second region, be used for responding to the second atmospheric pressure in the second region; and the processor determines the state of the color wheel at least according to the first air pressure and the second air pressure, and controls to turn off the laser when determining that the state of the color wheel is a non-working state.
The application still provides a colour wheel protection method, is applied to projection arrangement, projection arrangement includes driving piece, colour wheel, first response unit and second response unit, the driving piece is used for the drive the colour wheel rotates, first region and second region have around the colour wheel, first region be with the distance of colour wheel is less than and equals to predetermine the region of distance, the second region be for with the distance of colour wheel is greater than predetermine the region of distance, first response unit sets up in the first region, the second response unit sets up in the second region. The color wheel protecting method comprises the steps that a first sensing unit senses first air pressure in a first area, and a second sensing unit senses second air pressure in a second area; and determining the state of the color wheel at least according to the first air pressure and the second air pressure, and controlling to turn off the laser when the state of the color wheel is determined to be a non-working state.
According to the projection device and the color wheel protection method thereof, the first sensing unit is arranged in the first area to sense first air pressure in the first area, and the second sensing unit is arranged in the second area to sense second air pressure in the second area; the processor determines the state of the color wheel at least according to the first air pressure and the second air pressure, and controls to turn off the laser when the state of the color wheel is determined to be a non-working state, so that the color wheel is prevented from being burnt by the laser.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a projection apparatus in an embodiment of the present application.
Fig. 2 is a block diagram of a projection apparatus according to an embodiment of the present application.
Fig. 3 is a linear relationship between the rotation speed of the color wheel and the air pressure in an embodiment of the present application.
Fig. 4 is a linear relationship between the rotation speed of the color wheel and the air pressure in another embodiment of the present application.
Fig. 5 is a graph of color wheel rotation time versus air pressure for yet another embodiment of the present application.
Fig. 6 is a linear relationship between the color wheel rotation time and the air pressure in another embodiment of the present application.
Fig. 7 is a graph of color wheel rotation time versus air pressure for yet another embodiment of the present application.
Fig. 8 is a graph of color wheel rotation time versus air pressure for yet another embodiment of the present application.
Fig. 9 is a flowchart illustrating a color wheel protection method applied to a projection apparatus according to an embodiment of the present application.
FIG. 10 is a sub-flowchart of step 920 in an embodiment of the present application.
FIG. 11 is a sub-flow diagram of step 920 in another embodiment of the present application.
Detailed Description
In order to make the technical solutions of the present invention better understood by those skilled in the art, the technical solutions in the embodiments of the present invention will be clearly described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terms "first," "second," and "third," etc. in the description and claims of the present invention and the above-described drawings are used for distinguishing between different objects and not for describing a particular order. Furthermore, the terms "comprises" and any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.
Referring to fig. 1 and fig. 2 together, fig. 1 is a schematic structural diagram of a projection apparatus 100 according to an embodiment of the present disclosure, and fig. 2 is a schematic block diagram of the projection apparatus 100 according to an embodiment of the present disclosure. The projection apparatus 100 includes a processor 10, a driving member 20, a color wheel 30, a first sensing unit 40 and a second sensing unit 50. The processor 10 is electrically connected to the driving member 20, the first sensing unit 40 and the second sensing unit 50, respectively. The driving member 20 and the color wheel 30 are coaxially disposed and connected to each other. The driving member 20 is used for driving the color wheel 30 to rotate. The color wheel 30 has a first region 31 and a second region 33 around it. The first region 31 is a region having a distance from the color wheel 30 smaller than or equal to a predetermined distance, and the second region 33 is a region having a distance from the color wheel 30 larger than the predetermined distance. The first sensing unit 40 is disposed in the first area 31 and is used for sensing a first air pressure P1 in the first area 31. The second sensing unit 50 is disposed in the second area 33, and is used for sensing a second air pressure P2 in the second area 33. The processor 10 determines the state of the color wheel 30 according to at least the first air pressure P1 and the second air pressure P2, and controls to turn off the laser when determining that the state of the color wheel 30 is the non-working state. Therefore, the color wheel 30 can be effectively prevented from being burned by the laser when the rotating speed is low or the rotation is stopped.
Specifically, the working state of the color wheel 30 refers to a state in which the color wheel 30 rotates at a preset rotation speed and meets the laser turn-on condition. The state meeting the laser turn-on condition is a state in which the color wheel 30 is not burned out when the laser is turned on. The non-operating state of the color wheel 30 refers to a state where the color wheel 30 does not rotate at the preset rotation speed, that is, the rotation speed of the color wheel 30 is less than the predetermined rotation speed, and thus the laser turn-on condition is not met, for example, a state where the rotation speed is reduced or stopped.
Specifically, in one embodiment, the processor 10 determines the state of the color wheel 30 according to at least the first air pressure P1 and the second air pressure P2, including: the processor 10 calculates an absolute value of a difference between the first air pressure P1 and the second air pressure P2, determines that the color wheel 30 is in a non-operating state when the absolute value of the difference is smaller than a preset threshold, and controls to turn off the laser.
More specifically, the first sensing unit 40 is configured to sense a first air pressure P1 in the first area 31 and generate a corresponding first sensing signal. The second sensing unit 50 is configured to sense a second air pressure P2 in the second area 33 and generate a corresponding second sensing signal. The processor 10 receives the first sensing signal and determines a first air pressure P1 sensed by the first sensing unit 40 located in the first area 31 according to the first sensing signal. The processor 10 further receives the second sensing signal and determines a second air pressure P2 sensed by the second sensing unit 50 located in the second area 33 according to the second sensing signal. The processor 10 calculates an absolute value of a difference between the first air pressure P1 and the second air pressure P2, and determines that the state of the color wheel 30 is a non-operating state and controls to turn off the laser when the absolute value of the difference is less than a preset threshold. Therefore, the color wheel 30 can be effectively prevented from being burned by the laser when the rotating speed is low or the rotation is stopped.
Further, in an embodiment, the preset threshold is equal to zero, that is, the processor 10 determines that the first air pressure P1 in the first region 31 and the second air pressure P2 in the second region 33 are equal, and determines that the color wheel 30 is in the rotation stopping state, wherein the rotation stopping state is one of the non-operating states, and the laser is controlled to be turned off to avoid the color wheel 30 being burned by the laser.
In another embodiment, the preset threshold is greater than zero and less than a preset value, that is, when the processor 10 determines that the absolute value of the difference is greater than zero and less than the preset value, it determines that the color wheel 30 is in the non-operating state, and controls to turn off the laser, so as to prevent the color wheel 30 from being burned by the laser in the non-operating state with a low rotation speed.
Specifically, in an embodiment, the preset distance is a farthest distance that the rotation of the color wheel 30 in the working state can affect the air pressure, the first area 31 is an area that is close to the color wheel 30 and the air pressure is affected by the rotation of the color wheel 30 when the color wheel 30 rotates, and the second area 33 is an area that is far from the color wheel 30 and the air pressure is not affected by the rotation of the color wheel 30 when the color wheel 30 rotates.
Since the rotation of the color wheel 30 drives the accelerated flow of the air around the color wheel 30, and the first region 31 is closer to the color wheel 30 than the second region 33, the rotation of the color wheel 30 reduces the air pressure in the first region 31 close to the color wheel 30, and the influence of the rotation of the color wheel 30 on the air pressure in the second region 33 is relatively small. Therefore, when the color wheel 30 rotates, the first air pressure P1 in the first region 31 is smaller than the second air pressure P2 in the second region 33.
Referring to fig. 3, the faster the rotation speed of the color wheel 30 is, the greater the influence of the rotation of the color wheel 31 on the air pressure of the surrounding air is, and conversely, the slower the rotation speed of the color wheel 30 is, the smaller the influence of the rotation of the color wheel 31 on the air pressure of the surrounding air is. Therefore, when the color wheel 30 decelerates, the absolute value of the difference between the first air pressure P1 in the first region 31 and the second air pressure P2 in the second region 33 gradually decreases. On the contrary, when the color wheel 30 accelerates, the absolute value of the difference between the first air pressure P1 in the first region 31 and the second air pressure P2 in the second region 33 gradually increases.
Further, referring to fig. 4, when the color wheel 30 stops rotating, the first air pressure P1 in the first area 31 is equal to the second air pressure P2 in the second area 33.
Therefore, whether the state of the color wheel 30 is an operating state or not can be determined according to the magnitude relationship between the first air pressure P1 in the first area 31 and the second air pressure P2 in the second area 33, and when the state of the color wheel 30 is a non-operating state, the laser is controlled to be turned off, so that the color wheel 30 is prevented from being burned by the laser.
Referring to fig. 5, when the color wheel 30 rotates, the ambient air is driven to flow, and the air pressure changes, so that the first air pressure P1 closer to the first region 31 of the color wheel 30 is smaller than the second air pressure P2 farther from the second region 33 of the color wheel 30, and when the rotation speed of the color wheel 30 is constant, the absolute value Δ P of the difference between the second air pressure P2 and the first air pressure P1 is P2-P1, and Δ P is a constant value. However, in actual operation, since the first sensing unit 40 and the second sensing unit 50 are close to each other and the environmental conditions are substantially consistent, it can be approximately considered that the variable condition is mainly the rotation of the color wheel 30, but other factors may still affect the air pressure around the color wheel 30, so the processor 10 further sets an absolute value σ of an error value as a margin, and when Δ P ∈ (Δ P- σ, Δ P + σ), the state of the color wheel 30 can be considered as the operating state.
The above-mentioned factors affecting the air pressure may include, but are not limited to, temperature, that is, the rotation of the color wheel 30 drives the temperature of the air around the color wheel to increase, thereby causing the air pressure around the color wheel to increase. Specifically, referring to fig. 6, the rotation of the color wheel 30 drives the temperature of the air around the color wheel to increase, so as to promote the first air pressure P1 and the second air pressure P2 to increase, but as long as the processor 10 determines the absolute value Δ P e (Δ P- σ, Δ P + σ) of the difference, the state of the color wheel 30 can be determined as the working state.
In another embodiment, the processor 10 determines the state of the color wheel 30 according to at least the first air pressure P1 and the second air pressure P2, including: the processor 10 calculates an absolute value of a difference between the first air pressure P1 and the second air pressure P2, and calculates a change rate of the first air pressure P1 at the current time, and determines that the state of the color wheel 30 is a non-operating state when the absolute value of the difference is smaller than a preset threshold value and the change rate is greater than a preset value.
Specifically, referring to fig. 7, in the process of normal rotation at a fixed rotation speed of the color wheel 30, when the speed is reduced from time t, at time t, Δ P changes and gradually approaches to zero, but since the speed of the color wheel 30 is reduced, the speed at which Δ P changes is relatively slow, in order to monitor the state of the color wheel 30 more sensitively, the change rate at time t needs to be calculated:
where ts is a time axis, t is a current time, t-is a previous time, t + is a next time, P1(ts) is an air pressure at the time ts, P1(t) is an air pressure at the time t, P1 is an air pressure change rate of the current time with respect to the previous time, and Pr is an air pressure change rate of the current time with respect to the next time. When the processor 10 determines that Pl ≈ Pr is not true, i.e., the air pressure change rate at time t is large, and Δ P changes, it determines that the color wheel 30 is in a non-operating state, and issues a laser turn-off command to turn off the laser.
Referring to fig. 8, if the speed of the color wheel 30 is decelerated and stopped from time t during normal rotation at a fixed rotation speed, at time t, Δ P changes and approaches zero rapidly, and in order to monitor the state of the color wheel 30 more sensitively, the change rate at time t needs to be calculated:
where ts is a time axis, t is a current time, t-is a previous time, t + is a next time, P1(ts) is an air pressure at the time ts, P1(t) is an air pressure at the time t, P1 is an air pressure change rate of the current time with respect to the previous time, and Pr is an air pressure change rate of the current time with respect to the next time. When the processor 10 determines that Pl ≈ Pr is not true, i.e., the air pressure change rate at time t is large, and Δ P changes, it determines that the color wheel 30 is in a non-operating state, and issues a laser turn-off command to turn off the laser.
Please refer to fig. 9, which is a flowchart illustrating a color wheel protection method according to an embodiment of the present application. The color wheel protection method is applied to the projection device 100. The projection apparatus 100 includes a driving member 20, a color wheel 30, a first sensing unit 40 and a second sensing unit 50. The driving member 20 and the color wheel 30 are coaxially disposed and connected to each other. The driving member 20 is used for driving the color wheel 30 to rotate. The color wheel 30 has a first region 31 and a second region 33 around it. The first region 31 is a region having a distance from the color wheel 30 smaller than or equal to a predetermined distance, and the second region 33 is a region having a distance from the color wheel 30 larger than the predetermined distance. The first sensing unit 40 is disposed in the first region 31. The second sensing unit 50 is disposed in the second region 33. The order of execution of the color wheel protection method is not limited to the order shown in fig. 9. The method comprises the following steps:
in step 910, the first sensing unit 40 senses a first air pressure P1 in the first area 31, and the second sensing unit 50 senses a second air pressure P2 in the second area 33. Specifically, the first sensing unit 40 senses a first air pressure P1 in the first area 31 and generates a corresponding first sensing signal; the second sensing unit 50 senses a second air pressure P2 in the second area 33 and generates a corresponding second sensing signal.
And 920, determining the state of the color wheel 30 according to at least the first air pressure P1 and the second air pressure P2, and controlling to turn off the laser when the state of the color wheel 30 is determined to be the non-working state.
Specifically, the processor 10 determines the state of the color wheel 30 according to at least the first air pressure P1 and the second air pressure P2, and controls to turn off the laser when determining that the state of the color wheel 30 is the non-working state.
Specifically, referring to fig. 10 together, in an embodiment, the step 920 includes the following sub-steps:
Specifically, referring to fig. 10 together, in another embodiment, the step 920 includes the following sub-steps:
step 9201', calculate the absolute value of the difference between the first pressure P1 and the second pressure P2, and calculate the rate of change of the first pressure P1 at the current time. Specifically, the processor 10 calculates an absolute value of a difference between the first air pressure P1 and the second air pressure P2, and calculates a rate of change of the first air pressure P1 at the present time.
Step 9202 ', it is determined whether the absolute value of the difference is smaller than a preset threshold, and it is determined whether the change rate is greater than a preset value, if the absolute value of the difference is smaller than the preset threshold and the change rate is greater than the preset value, step 9203 ' is performed, otherwise, step 9201 ' is performed. Specifically, the processor 10 determines whether the absolute value of the difference is smaller than a preset threshold, and determines whether the change rate is greater than a preset value, if the absolute value of the difference is smaller than the preset threshold and the change rate is greater than the preset value, step 9203 'is performed, otherwise, step 9201' is performed.
In the projection apparatus and the color wheel protection method thereof, when the color wheel 30 rotates, the first sensing unit 40 is configured to sense a first air pressure P1 in the first area 31. The second sensing unit 50 is used for sensing a second air pressure P2 in the second area 33. The processor 10 determines the state of the color wheel 30 according to at least the first air pressure P1 and the second air pressure P2, and controls to turn off the laser when determining that the state of the color wheel 30 is the non-working state, so as to prevent the color wheel 30 from being burned by the laser. Therefore, the color wheel 30 can be effectively prevented from being burned by the laser when the rotating speed is low or the rotation is stopped.
It should be noted that, for simplicity of description, the above-mentioned embodiments of the method are described as a series of acts or combinations, but those skilled in the art should understand that the present application is not limited by the order of acts described, as some steps may be performed in other orders or simultaneously according to the present application. Further, those skilled in the art should also appreciate that the embodiments described in this specification are preferred embodiments and that the acts and modules involved are not necessarily required for this application.
In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
The steps in the method of the embodiment of the application can be sequentially adjusted, combined and deleted according to actual needs.
The Processor 10 may be a Central Processing Unit (CPU), other general-purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf Programmable Gate Array (FPGA) or other Programmable logic device, a discrete Gate or transistor logic device, a discrete hardware component, or the like. The general purpose processor may be a microprocessor or the processor may be any conventional processor or the like, the processor being the control center of the projection device 100 and connecting the various parts of the entire projection device 100 using various interfaces and lines.
It is understood that the projection device 100 further includes a memory (not shown), and various data of the projection device 100 can be stored in the memory. The memory is specifically used for storing the computer program and/or the module, and the processor 10 implements various functions of the projection apparatus 100 by running or executing the computer program and/or the module stored in the memory and calling data stored in the memory. The memory may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, application programs (such as a sound playing function, an image playing function, etc.) required by a plurality of functions, and the like; the storage data area may store data (such as audio data, a phonebook, etc.) created according to the use of the cellular phone, and the like. In addition, the memory may include high speed random access memory, and may also include non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), a plurality of magnetic disk storage devices, a Flash memory device, or other volatile solid state storage devices.
The foregoing is an implementation of the embodiments of the present application, and it should be noted that, for those skilled in the art, several modifications and decorations can be made without departing from the principle of the embodiments of the present application, and these modifications and decorations are also regarded as the protection scope of the present application.
Claims (10)
1. A projection device is characterized by comprising a processor, a driving part, a color wheel, a first sensing unit and a second sensing unit, wherein the driving part is used for driving the color wheel to rotate, a first area and a second area are arranged around the color wheel, the distance between the first area and the color wheel is smaller than or equal to a preset distance, the distance between the second area and the color wheel is larger than the preset distance, the first sensing unit is arranged in the first area and used for sensing first air pressure in the first area, and the second sensing unit is arranged in the second area and used for sensing second air pressure in the second area; and the processor determines the state of the color wheel at least according to the first air pressure and the second air pressure, and controls to turn off the laser when determining that the state of the color wheel is a non-working state.
2. The projection apparatus of claim 1, wherein the processor determines the state of the color wheel based on at least the first air pressure and the second air pressure, comprising: the processor calculates the absolute value of the difference value between the first air pressure and the second air pressure, and determines that the color wheel is in a non-working state when the absolute value of the difference value is smaller than a preset threshold value.
3. The projection apparatus of claim 1, wherein the processor determines the state of the color wheel based on at least the first air pressure and the second air pressure, comprising: the processor calculates the absolute value of the difference value between the first air pressure and the second air pressure, calculates the change rate of the first air pressure at the current moment, and determines that the color wheel is in a non-working state when the absolute value of the difference value is smaller than a preset threshold value and the change rate is larger than a preset value.
4. The projection apparatus according to any one of claims 1 to 3, wherein the predetermined distance is a farthest distance that the rotation of the color wheel can affect the air pressure when the color wheel is in the working state, the first region is a region close to the color wheel and where the air pressure is affected by the rotation of the color wheel when the color wheel rotates, and the second region is a region away from the color wheel and where the air pressure is not affected by the rotation of the color wheel when the color wheel rotates.
5. The projection apparatus of claim 1, wherein the absolute value Δ P of the difference between the second air pressure and the first air pressure is a constant value when the rotation speed of the color wheel is constant, the processor further sets an absolute value σ of an ambient error value, and the processor determines that the color wheel is in an operating state when Δ P ∈ (Δ P- σ, Δ P + σ).
6. A color wheel protection method is applied to a projection device, the projection device comprises a driving part, a color wheel, a first induction unit and a second induction unit, the driving part is used for driving the color wheel to rotate, a first area and a second area are arranged around the color wheel, the distance between the first area and the color wheel is smaller than or equal to a preset distance, the distance between the second area and the color wheel is larger than the preset distance, the first induction unit is arranged in the first area, and the second induction unit is arranged in the second area, the color wheel protection method is characterized by comprising the following steps:
the first sensing unit senses a first air pressure in the first area, and the second sensing unit senses a second air pressure in the second area;
and determining the state of the color wheel at least according to the first air pressure and the second air pressure, and controlling to turn off the laser when the state of the color wheel is determined to be a non-working state.
7. The color wheel protection method of claim 6, wherein the step of determining the status of the color wheel according to at least the first air pressure and the second air pressure, and controlling the laser to be turned off when the status of the color wheel is determined to be the non-working status comprises:
and calculating the absolute value of the difference value between the first air pressure and the second air pressure, determining that the color wheel is in a non-working state when the absolute value of the difference value is smaller than a preset threshold value, and controlling to close the laser.
8. The color wheel protection method of claim 6, wherein the step of determining the status of the color wheel according to at least the first air pressure and the second air pressure, and controlling the laser to be turned off when the status of the color wheel is determined to be the non-working status comprises:
and calculating the absolute value of the difference between the first air pressure and the second air pressure, calculating the change rate of the first air pressure at the current moment, determining that the color wheel is in a non-working state when the absolute value of the difference is smaller than a preset threshold value and the change rate is larger than a preset value, and controlling to turn off the laser.
9. The color wheel protection method according to any one of claims 6 to 8, wherein the preset distance is the farthest distance that the rotation of the color wheel in the working state can affect the air pressure, the first region is a region close to the color wheel and the air pressure is affected by the rotation of the color wheel when the color wheel rotates, and the second region is a region away from the color wheel and the air pressure is not affected by the rotation of the color wheel when the color wheel rotates.
10. The color wheel protection method as claimed in claim 6, wherein the color wheel protection method further comprises:
when the rotating speed of the color wheel is constant and the absolute value delta P epsilon (delta P-sigma, delta P + sigma) of the difference value between the first air pressure and the second air pressure is determined, the color wheel is determined to be in the working state, wherein the sigma is the absolute value of the environment error value.
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| CN201810626371.9A CN110609432B (en) | 2018-06-15 | 2018-06-15 | Projection device and color wheel protection method thereof |
| PCT/CN2019/076625 WO2019237767A1 (en) | 2018-06-15 | 2019-03-01 | Projection device and color wheel protection method thereof |
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| CN201810626371.9A CN110609432B (en) | 2018-06-15 | 2018-06-15 | Projection device and color wheel protection method thereof |
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| JP2604213Y2 (en) * | 1993-11-09 | 2000-04-24 | 旭光学工業株式会社 | Focus correction device |
| JP3460435B2 (en) * | 1996-03-22 | 2003-10-27 | 富士ゼロックス株式会社 | Fixing device |
| ES2174673B1 (en) * | 1999-07-12 | 2003-08-01 | Vijay Atawane | SECURITY SYSTEM TO AVOID DOCUMENT PHOTOCOPYING. |
| CN1782856A (en) * | 2004-12-03 | 2006-06-07 | 乐金电子（沈阳）有限公司 | Automatic control method for chromatic circle |
| JP4860533B2 (en) * | 2007-03-30 | 2012-01-25 | Ｎｅｃディスプレイソリューションズ株式会社 | Projection display |
| JP2010032944A (en) * | 2008-07-31 | 2010-02-12 | Panasonic Corp | Projection display device |
| CN101750855B (en) * | 2008-12-19 | 2011-11-16 | 绎立锐光科技开发(深圳)有限公司 | Protective method and device of projection system and tinting device |
| JP5311137B2 (en) * | 2009-09-28 | 2013-10-09 | カシオ計算機株式会社 | Light source device and projector provided with light source device |
| JP5610185B2 (en) * | 2009-11-30 | 2014-10-22 | カシオ計算機株式会社 | Rotation detection device, light source unit and projector |
| CN103988126B (en) * | 2011-11-21 | 2016-01-20 | 日立麦克赛尔株式会社 | Projector apparatus |
| CN102645822B (en) * | 2011-11-28 | 2014-12-10 | 深圳市光峰光电技术有限公司 | Projecting apparatus and control method thereof |
| CN103235470A (en) * | 2013-03-07 | 2013-08-07 | 芜湖雅图数字视频技术有限公司 | Method and equipment for protecting fluorescent color wheels |
| CN103277327A (en) * | 2013-06-17 | 2013-09-04 | 浙江理工大学 | Variable-pitch bladeless fan turbine device |
| CN104708990A (en) * | 2015-01-15 | 2015-06-17 | 朱晓义 | Vehicle wheel |
| CN106226541B (en) * | 2016-08-17 | 2018-07-13 | 江苏英诺华医疗技术有限公司 | A kind of automatic clinical chemistry analyzer of novel low cross contamination |
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